Wash the potatoes thoroughly and cook in boiling water for about 20 minutes. In the meantime, clean and wash the chanterelles thoroughly and drain them well. Peel and finely chop the onion. Clean, wash and cut the beans into pieces and cook them in boiling salted water for about 15 minutes.
Drain and let drain well. Drain the potatoes, rinse and peel. Roast pumpkin seeds in a pan without fat while turning, remove. Heat oil in the pan. Sauté chanterelles in it, season with salt and pepper, take out.
Add onion and fry until transparent. Deglaze with stock and vinegar, bring to the boil, season with salt, pepper and sugar. Mix potatoes, chanterelles and beans. Pour vinaigrette over it, mix.
Drizzle pumpkin seed oil over it and let it stand for about 1 hour. Arrange in small bowls garnished with oregano and sprinkled with pumpkin seeds.